/* -------------------------------------------------------------------------
 *
 * dynloader.c
 *	  dynamic loader for HP-UX using the shared library mechanism
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  src/backend/port/dynloader/hpux.c
 *
 *	NOTES
 *		all functions are defined here -- it's impossible to trace the
 *		shl_* routines from the bundled HP-UX debugger.
 *
 * -------------------------------------------------------------------------
 */
#include "postgres.h"
#include "knl/knl_variable.h"

/* System includes */
#include <a.out.h>
#include <dl.h>

#include "dynloader.h"
#include "utils/dynamic_loader.h"

void* pg_dlopen(char* filename)
{
    /*
     * Use BIND_IMMEDIATE so that undefined symbols cause a failure return
     * from shl_load(), rather than an abort() later on when we attempt to
     * call the library!
     */
    shl_t handle = shl_load(filename, BIND_IMMEDIATE | BIND_VERBOSE | DYNAMIC_PATH, 0L);

    return (void*)handle;
}

PGFunction pg_dlsym(void* handle, char* funcname)
{
    PGFunction f;

    if (shl_findsym((shl_t*)&handle, funcname, TYPE_PROCEDURE, &f) == -1)
        f = (PGFunction)NULL;
    return f;
}

void pg_dlclose(void* handle)
{
    shl_unload((shl_t)handle);
}

char* pg_dlerror(void)
{
    static char errmsg[] = "shl_load failed";

    if (errno)
        return gs_strerror(errno);

    return errmsg;
}
